The Capitals seized an unlikely victory on Monday. The home team was outplayed throughout, but one improbable shot from Jay Beagle and a superlative effort from Braden Holtby gave the Caps a series lead they might not have otherwise deserved. If they want to put the Rangers on the brink of elimination, tonight at 7:30 PM on NBCSN, they’re gonna have to get better results from their top line.